“Okay. Now look at the bottom of the brain—the brainstem. This part of the brain controls less complex, mostly regulatory, functions like body-temperature regulation, breathing, heart rate, and so forth. But there are no networks in the bottom part that think or tell time. Sometimes we refer to this part of the brain as the reptilian brain, so think of what a lizard can do—they don’t plan much, or think; they mostly live in the moment and react. But we humans, thanks to the top part of our brain—the cortex—can invent, create, plan, and tell time.”
